59 lines
963 B
C
59 lines
963 B
C
#include <stdio.h>
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <stdlib.h>
|
|
|
|
static double parse_double(const char *str) {
|
|
char *ptr;
|
|
|
|
double res = strtod(str, &ptr);
|
|
if (*ptr) {
|
|
fprintf(stderr, "seq: %s: cant parse\n", ptr);
|
|
exit(1);
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
int main(int argc, char **argv) {
|
|
double start = 1;
|
|
double last = 0;
|
|
double n = 1;
|
|
|
|
argv++;
|
|
argc--;
|
|
|
|
switch (argc) {
|
|
case 1:
|
|
last = parse_double(argv[0]);
|
|
break;
|
|
|
|
case 2:
|
|
start = parse_double(argv[0]);
|
|
last = parse_double(argv[1]);
|
|
break;
|
|
|
|
case 3:
|
|
n = parse_double(argv[1]);
|
|
start = parse_double(argv[0]);
|
|
last = parse_double(argv[2]);
|
|
break;
|
|
|
|
default:
|
|
fprintf(stderr, "seq: missing operands\n");
|
|
return 1;
|
|
}
|
|
|
|
if (start <= last && n >= 0) {
|
|
for (double i = start; i <= last; i += n)
|
|
printf("%g\n", i);
|
|
}
|
|
|
|
else if (n <= 0)
|
|
for (double i = start; i >= last; i += n)
|
|
printf("%g\n", i);
|
|
|
|
return 0;
|
|
}
|